Q. 5 D

# Let U = {1, 2, 3,

A B = {x: x ϵ A or x ϵ B}

= {1, 2, 3, 4, 6, 8}

(AB)’ means Complement of (AB) with respect to universal set U.

So, (AB)’ = U – (AB)’

U – ( AB)’ is defined as {x ϵ U : x (AB)’}

U = {1, 2, 3, 4, 5, 6, 7, 8, 9}

(AB)’ = {1, 2, 3, 4, 6, 8}

U – ( AB)’ = {5, 9}

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